Production of expanded sheet metal (herringbone type)



Nov. 17 I 1925. 1,562,158

H.M.GERSMAN PRODUCTION OF EXPANDED SHEET METAL {HERRINGONE TYPE? Filed Juri-. 1, 192s- 5 2 sheets-sheet 1 VIZ Itter/1g Nov. 17, 1925- 1,562,158 H. M. GERSMAN PRODUCTION OF EXPANDED SHEET METAL` (HERRINGBONE TYPE) Filed June'l, 1923 2 Sheets-Sheet 2 /Q /s Fif- Jn ve n far #ARI/7 /\7. GERS/VIA Patented Nov. 17, 1925. i i Y l UNITED STATES PATENT `FF`ICE. f

` HARVEY MjG'EnsMAm'oF oI-I'Icnero,.ILKLIivoIs;A p y'` i PRODUCTION or EXYPANDEDISHEET nnranrnnnnnveonn TYPE).

` applicati-ibn mea rime 1, 1923. seriai no. 642,873. y i l To all whom t may concern: f Figure 8 is an elevation of the outer or Be it known that I, HARVEY M. GERSMAN, .obverse face of a fragmentary portion of the' 50 a citizen of the United States, residing at :sheet expanded from the blank of Figure 5,y Chicago, in the county of Cook and State and is` drawn to a scale con-forming to A-the` of Illinois, have invented a new and useful scale of Figures 4 to 7.,;

Improvement in the Production of Expand-` Figure 9,shoWs the blanky for a doubleed Sheet Metal (Herringbone Type), of sided sheet. v i 4 55 which the followingl is a specilication. Figure 10 is a sectiononthe line-10-#1O14 Thisfinvention relates to the production of Figure 9. l y l0 of expanded sheet metal and its principal Figure 11 is a cross sectionof the blank object is to yprovide a method of simple shown 1n Figure 9. v j character for the production of expanded Referringto Figures1,2 and 3:y 6oA sheet metal having novel structural features These figures illustrate a vfragment of an and superior qualities, such expanded metal expanded metal sheety having parallel im-. forming the subject of my co-pending apperforate portions or webs 12 and expanded plication Serial No. 642,872. portions between the imperforate portions,

Herringbone is the Vname applied to a the` expanded p0rti0nsbeing characterized 65 form of expanded metal lathing which is bypaced parallelfstrands 13 which prefer- Vi characterized by parallel webs and by Lably extend diagonally betweenthe adjacent v spaced parallel strands extending between ,'WebS; The Strands 13 of each expanded and connecting the adjacent webs. In so portion lie flat in a common plane andthe far as expanded metal produced by the connections by which they are joined to the 7o method of the present invention conforms to adjacent. webs are disposed at the same, that these broadly stated characteristics of her 1S t 0 Say oorrespondin'gsides of said webs rngbone metal it may be Conveniently des.. which, as parts of lathing, also lie Hat in a l gna'd as of the herringbone type, Y .common plane. The connectionsv between The manner of practicing the invention the str ands and the webs include portions, 7 will be apparent ,from the accompanying 14, Whloh 'are ofSfet'rOIIl the Webs Il plal' drawings, taken in connection with the de- IlOrIIlal t0 the Common plane ofgthe strands. SCI-ipton which follows, 4 The common plane of the strands is prefer- In said drawings; A ably offset from andgparallel to the common Figure l is an elevation of the outer or Plane 0f hGWGlOS, the OSG'ES 14 determining 80 observe face of a fragmentary portion of the @levltloll 0f the .Strands relatively to either a single or double sided sheet eXpandthe Wl0S The OffStS 14: are arranged at the ed 4by the method of the present invention. "SlfQS .Q the. Webs and along each slide pro- Figure 2 is a cross ysectional view on the Vldeyf 111i .fllIlCtlOQal effect, a rib Parallel '03. 1in@ 2 2 of Figure 1 j 4 the-web v andgwhich re-inforces the sheet` in 85 Figure 3 is a longitudinal sectional view ,the ,longltudllal dlrCtOll, COllSderingthevv on the line 3-3 of Figure 2. Y webs as vexjtendlng lengthwise of the sheet.` 40 Figure 4f is anelevation showing an ini- 'ljhestlandsphavet thelr' endsangular portial stage in the formation of the blank /forf tlOIlS 15 WhlCh eXeIld .frOIIl the OfSGS 1-1y a single-sided sheet. j and may be regarded-as angular extensions .90

Figure 5 shows the blank ready for lex- OfhQOffSetS., @he POPIODS l5 being delmpangon, j j o i ed breaks, 1. e., lines Vof bending, 16 and Figure 6 is@ Section 0n the linee-6 O-E 17 which extend at angles to one another Figure 5. i from; the corners of the'offsets ,remote from Figure 7 is a cross section of the blank the webs. The breaks 16 lie in the plane of `95 shown in Figure 5. f l the offsets and extend tothe webs, formingA them andA it will be understoo'dwthatthe fragf ment shownmlkmay be regardedjxaseither of a single sided sheet or a double sided sheet.

portions are arranged at the same, i. e., corresponding,` sides of the' webs', such afsheet beingkcompletely/self urring: In a double' sided sheet the expanded portionsare, ar

ranged. Vlalternately at AoppositeA sides of' the webs. The strands preferably" extend di'-y ag-onally:and'mayfY exten-dall inthe samedirection or, as preferred, in the alternate eX- pa'nded 'portions they. may `extend in opposite directions.

The method is practiced in Connection with a slitted blank whiclinv all` cases'is formed whereby" ini' the expandedshee't the bends or breaks'at both 'ends otea'ch strand will foccu'r at corresp'ondingfsides'of the ad'- jac'ent webs and `iii relationtooifset's lying* in planes substantially.lnormall to the plane ofthe sti'andan'd'whereby by afsingle ex'- duced-'in completed form with V its webs ina common plane andfthe" strands of each eX`` panded portion in" a common plane, preferably-offset from"` and parallel to tlief'conrmon plane of the webs.'

The specific structure disclosed inlay," as'l embodied 'in single '"'si'ded 'sheets,`be produced fronrthelblank shown'vin Figures" 5, 'an'd' 7 and" as embodied in double sifdedsheets be f produced from theblankshewnfinE Figures; 9, 1() and 11. 1t 'will'be under's'too'dhow'evei`V thatthe' illustration ofthe'blank's andthe description to follow* of 'the Vmethod of iexi pansion is not to" be' taken fas iinposingrlimi tations vlto the eXact form of`v` blankz illus tratedy or to the 'exact details'ofth'e method described, 4since withi'ir'the liinit'siofithe invention variations" may' beg y'incorp''oratedinf the" form of thel blank' 'regards the outline? and arrangement ofthcislitsandvdetails off the method' Aas "regards the "distortion l"oi'the blank inciden't vto the eXpansion. T

a Referringto Figures-'4; 5; Gfa'i'i'cl 7.:

ll'l'iey blank" is produced *rmf a sheet' of lat metal formed with l'rows of slits-18"?(Figiurey 41), the slitsof` each rwdeliinitingfthe i area'fin which'eXi'ia/nsion"y isr effected? and the imperforate spaces 19 between the rowsofI slits being* available 'for the webs;y Thel slits 1,

are similarly arranged and each terminates at differently located points along the edges of the imperforatel portions between which it-extends. As shown the slits are arranged diagonally, extending in opposite directions in the alternate rows. AThe fiat sheet provided with the slits, as described, is then longitudinally corrugated to provide the completed blank shown in Figures 6 and 7 The longitudinal corrugations are alternatelyinverse and consist of cori'ugations 2() presenting.A channels to the obverse face of the `blankand coi'riigations 21 presenting channels Vto the reversefiace ofthe blank. The adjoining inverse corrugations have common"'sides'which'are struck up along the opposite sides of the slitted portions where-` by, in the embodiment"disclosed, theslits '18` extend tlirouglio'u't the bases and' "sides oi: the co'rrugatioiis` 21.v The :completed blank is then expai'i'dedv or "stretched 'in a direction of I its 'mean plane.v vk1"i7ith"thefspecific forni off blank'L d'i'sclosedthe alternate 'p'ortions19 are' rotated inthesanie'direction intheir com. Y

vthev scaleot'digures fto 7 being-'shown in Figlifi'reSf Ii'r'con'n'ection with the 'expansion' of "thefiblank disclosed lthe 'portions off metal which provide 'the'side's' of the corrugations' 21 are utilized forfthe osets 14' and 'eXtensionsll. This will -fb'e' apparent byreference to '-Figri'ire'G from' whi'clifit will lbe observed l that the sidesof the' co'r'ri'igat'ions are made of-uni-forin vcont'eri'ni-no'us portions; each` of rhomboidal outline, whereof lthe* pairs of" adi jacent sides which form theac'ute anglesiare thesidesV of" the'f4 triangles delimited nby the oilsets 14"an'd the" eten'sions 15,' lthe sides which tadi'o'in'- the bases 'of the c'oi"ri'i'gationsV 'S21v coincide" iii'th the"l breaks'17,Y and' lilies taken common inter'cepto'rs rof the obtuse angles coincide with the bireaks'll developedl during thefez'p'anson Referring to Figui`es*9,-1O and 11: In this caseftheblaiil'r'is for'i'ned with loiigitu'dinal cbrrugations' andi 2lb corre'- l spending functionally to theloiigi'tudiii'al corrugations '3215 ofthe preceding eXa-inple but'formed alternately inversely and atthe ppcs-ite 'sidesothe' colplanar iinperforat'e portions 19 by which the sides of theadj'ar cent inverse corr-ngations are connected, the slits 18, as before, being extended through the sides of the corrugations tothe imperferate portions. The methods of expansion is precisely the saine as inthe preceding ex` ample but theform of` the blank results in double sided expanded sheets, that isto say .sheets wherein'the strands 13 of alternate -perforate portions and a row of similarly arranged slits between each pair of adjacent imperforate portions, each slit terminating at differently located points along the edges of the imperforate portions between which it extends, which consists in corrugating the slitted sheet to form acomplete blank and in expanding the blank by the yapplication of stretching force in a direction of its mean plane and wherein the corrugations of said blank are arranged in the directions of said imperforate portions and are so formed and related to said imperforate portions and slits that upon the application of the stretching force the imperforate portions will be produced as spaced parallel webs and the portions of the metal between the slits will be produced as strands lying flat in a common plane and bent from ofisets located at corresponding sides of said webs in planes normal tothe common plane of said strands. v

2. The method of producing expanded metal from a flat sheet having parallel imperforate portions and a row of similarly arranged slits between each pair of adjoining imperforate portions, each slit terminating at differently located points along the edges of the imperforate portions between which it extends, which consists inl corrugating the slitted sheet to form a complete blank and in expanding the blank by the application of stretching force in a direc-4 tion of its mean plane and wherein the corrugations of said blank are arranged in the directions of said imperforate portions and are so formed and related to said imperforate portions and slits that upon the application of the stretching force the imperforate portions will be produced as'spaced parallel webs lying flat in a common plane and the portions of the metal between thev slits will be produced as strands lying flat in a common plane and bent from offsets located at corresponding sides of said webs in planes normal'to said common planes of the webs and strands.

3. The method of producing expanded metal from a flat sheet having parallel imperforate portions and a row 'of similarly arranged slits between each pair of adjoining imperforate portions, each slit terminating at dierently located points along the edges of the imperforate portion between which it extendsfwhich consists kin corrugating the sheet along the slitted por-l tions, in a, direction 4vparallel. tofthe imperforate portionsto form a complete blank@ the sides of the corrugations extending from the imperforate portionsy and the slits ex-k said sides, andl in expanding theA blank by the application of stretching Jforce to rotate the imperforate portions relatively to one another in their common plane whereby the tending to thefimperforate portions throughf.y

imperforate portions will be produced as spaced parallel webs lying flat in a common plane and the portions of the metal between the slits will be produced as strands lyingk fiat in a common plane andbent from offsets located at corresponding sides of said webs in planes normal to said common planes of the webs and strands, the common plane of the strands being offset from and parallel to the common plane of the webs.

4. The method of producing expanded metal from a flat sheet having parallel imperforate portions and a row of parallel diagonal slits between each pair of adjoining imperforate portions, which consists in corrugatingv the sheet along the slitted portions in a direction parallel to the imperforate portions to form a complete blank, the sides of the corrugations extending'from the imperforate portions and the slits ex-` the slits will be produced as strands lyingy flat in a common plane and bent from offsets located at correspondingsides of said webs i in planes normal to said common planes of the webs and strands, the common plane of the strands being offset from and parallel to the common plane of the webs.

5. The method ofprodueing expanded metal from a Hat sheet whichy consists in cutting the sheet with rows of slits, leaving parallel imperforate portions between the slits, the slits of each row being similarly arranged and each slit terminating at diii'en ently located points along the edges of the imperforate portions between which it ex. tends, corrugating the sheet along the slitted portions, the corrugations being parallel to the imperforate portions and the slitted portions providing the bases and sides of the corrugations and expanding the corrugated slitted sheet by the applieationof stretchf ing force in a direction of the mean plane of the sheet.

6. The method of producing expanded metal from a flat sheet which consists in llO Cutting vthe vsheetwith` ro'Ws 'oit' slits7 leaving parallel' imperfoate" portions' bttveen the slits, th'lslitsof sachV rowv being'simil'arlyf arranged and'ea'ohslit torriiin'ating at dif ferontly located points alonglthe edgesv of the imperforate .poitions btiv'eii Which' it extends,` oorugatin'g the lshfeetA alongl the slitted' portions, ther` coii'ugation's 'losing-fpatr-v allel to lthe im'p'eforat poitioris which' are leftflat and the slittd portions providing thJ bases ahdj sides ofth ool'rugations' and expandingthe corrugated slittedsh'eet by i HARVEY GERSMAN. 

